Collocations for vacant - adj.

be
become, fall (only used of jobs)
A seat became vacant and he took it.
A job fell vacant in the accounting department.

remain
leave sth
The office of treasurer had been left vacant since her retirement.

keep sth
The job will be kept vacant for a few more weeks.

Vacant is used with these nouns:
expression, eye, house, land, look, lot, post, seat, shop, space, throne